# TS431ILT

**STMicroelectronics** · Voltage Reference · SOT-23-5

TS431ILT from STMicroelectronics, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | NC | unconnected | No connect pin with no internal function stated in the datasheet. |
| 2 | NC | unconnected | Do not connect this pin or connect it to Anode, per the datasheet footnote. |
| 3 | Cathode | passive | Cathode of the shunt reference, operating cathode current 0.06 to 30 mA and cathode-to-anode voltage 1.24 to 6 V (absolute maximum 10 V). |
| 4 | Reference | input | Reference input that sets the cathode voltage via an external divider, with Vref typically 1.24 V and absolute maximum input current of -0.05 to +3 mA. |
| 5 | Anode | power_in | Anode of the shunt reference, connected to the lowest circuit potential (ground). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Output voltage | Vref | 1.215 | 1.24 | 1.265 | V | VKA = Vref at Ik = 100 µA (TS431 2% column) | 5 |
| Output voltage change over temperature, 0 < Tamb < +70 °C | Vref |  |  | 9 | mV | Ik = 100 µA, VKA = Vref, 0 < Tamb < +70 °C | 5 |
| Output voltage change over temperature, -40 < Tamb < +85 °C | Vref |  |  | 16 | mV | Ik = 100 µA, VKA = Vref, -40 < Tamb < +85 °C | 5 |
| Output voltage change over temperature, -40 < Tamb < +105 °C | Vref |  |  | 18 | mV | Ik = 100 µA, VKA = Vref, -40 < Tamb < +105 °C | 5 |
| Output voltage change over temperature, -40 < Tamb < +125 °C | Vref |  |  | 21 | mV | Ik = 100 µA, VKA = Vref, -40 < Tamb < +125 °C | 5 |
| Ratio of change in reference input voltage to change in cathode to anode voltage |  |  | 1.8 | 2.7 | mV/V | Ik = 10 mA, VKA = 6 V to Vref | 5 |
| Reference input current | Iref |  | 70 | 160 | nA | Ik = 10 mA | 5 |
| Reference input current deviation over temperature range, -40 < Tamb < +85 °C | Iref |  | 70 | 160 | nA | Ik = 10 mA, R1 = 10 k, R2 = (symbol lost in extraction), -40 < Tamb < +85 °C | 5 |
| Reference input current deviation over temperature range, -40 < Tamb < +125 °C | Iref |  | 90 | 240 | nA | Ik = 10 mA, R1 = 10 k, R2 = (symbol lost in extraction), -40 < Tamb < +125 °C | 5 |
| Minimum cathode current for regulation | Imin |  | 40 | 60 | µA | VKA = Vref | 5 |
| Off-state cathode current | Ioff |  | 0.001 | 0.1 | µA | VKA = 6 V, Vref = 0 | 5 |
| Static impedance | RKA |  | 0.2 | 0.4 | Ω | VKA = Vref, Ik = 0.1 to 15 mA | 5 |
| Cathode to anode voltage | VKA | 1.24 |  | 6 | V |  | 4 |
| Cathode current | Ik | 0.06 |  | 30 | mA |  | 4 |
| Operating free air temperature range | Toper | -40 |  | 125 | °C |  | 4 |
| Cathode to anode voltage | VKA |  |  | 10 | V |  | 4 |
| Continuous cathode current range | Ik | -20 |  | 40 | mA |  | 4 |
| Reference input current range | Iref | -0.05 |  | 3 | mA |  | 4 |
| Power dissipation | Pd |  |  | 500 | mW | SOT23-5 package | 4 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 4 |
| Thermal resistance junction to ambient | RthJA |  |  | 250 | °C/W | SOT23-5L | 4 |
| Thermal resistance junction to case | RthJC |  |  | 136 | °C/W | SOT23-5L | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | Abs |  | Figure 2. Pinout L SOT23-5 (plastic micropackage) Absolute maximum ratings and operating conditions TS431 | 3 |

## CAD (KiCad official)

- Symbol: `TS431ILT`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `ts431ilt-etched.step` / `ts431ilt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ts431ilt.step` / `ts431ilt.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590445428006424577) (16 pp, sha256 `ec56fdab04a9692d`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ts431ilt-datasheet.pdf)